Set Environment Variable (ESV)

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The description adds behavioral details beyond annotations, such as internal JSON serialization for array/object types and the constraint that type cannot be changed after creation (noted in the type parameter description). Annotations already indicate idempotency and non-destructiveness, which align with the description.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The main description is a single sentence, which is concise but too brief for a tool with 4 parameters and siblings. It lacks structure (e.g., no summary of when to use) and could be improved by adding context upfront.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description covers the basic operation but omits important details like return behavior (no output schema), the fact that variableId must exist for updates, and the constraint on type immutability (only mentioned in parameter description). While annotations provide some context, the main description is incomplete.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 100% schema description coverage, the baseline is 3. The description adds value by providing examples for the value parameter and clarifying type constraints (e.g., 'prefer array over list' and 'type cannot change').

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description explicitly states the action ('Create or update') and the resource ('environment variable (ESV)') with the context ('in PingOne AIC'). This clearly distinguishes the tool from siblings like deleteVariable, getVariable, and queryESVs.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives (e.g., queryESVs for listing, getVariable for reading, deleteVariable for removal). It lacks usage context or prerequisite information.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.